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250 CHAPTER 11: SYSTEM MANAGEMENT
switch learns and adds in the MAC address table. After this, subsequent packets
destined for the same MAC address can be forwarded directly. If the MAC address
cannot be found after broadcasting the packet, the switch will drop it and notify
the transmitter that the packet did not arrive at the destination.
Figure 59 The Switch 7750 Forwards Packets According to the MAC Address Table
The Switch 7750 also provides the function of MAC address aging. If the switch
does not receive a packet from a MAC address for a set period of time, it will
delete the related entry from the MAC address table.
You can add or modify MAC address entries manually according to the actual
networking environment. The entries can be static or dynamic.
Configuring the MAC
Address Table
MAC address table management includes:
■ Setting MAC Address Table Entries
■ Disabling or Enabling Global MAC Address Learning
■ Disabling or Enabling MAC Address Learning on a Port
■ Setting MAC Address Aging Time
■ Displaying and Debugging the MAC Address Table
Setting MAC Address Table Entries
You can manually add, modify, or delete entries in a MAC address table according
to actual needs. you can also delete all (unicast) MAC address table entries related
to a specified port or delete a specified type of entries, such as dynamic or static
entries.
Use the following commands to add, modify, or delete the entries in MAC address
table.
MACD
MACA
....
Port 1
MAC Address Port
MACA
MACB
MACC
MACD
1
1
2
2
MACD MACA
Port 2
....